Published February 1, 1930
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Journal Article
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Sedimentation equilibria of colloidal particles
- Creators
- Johnston, Norris
- Howell, Lynn G.
Abstract
The purpose of this work was to find the distribution law of colloidal particles for sedimentation equilibrium in large cells, in which uniform concentrations had been observed by Burton, Porter and Laird. We took great care to eliminate effects which might prevent an equilibrium state. Gold particles prepared by the Zsigmondy nuclear method were allowed to settle several days in a quartz cell in a carefully controlled thermostat bath. The steady state was determined by taking visual ultra-microscopic counts on different days. The La Place-Perrin exponential law of distribution was found to hold as demanded by the kinetic theory.
Additional Information
©1930 The American Physical Society. Received 9 December 1929. We wish to express our gratitude to the American Petroleum Institute for the funds furnished for this research, to Dr. R. A. Millikan for his interest as director of this project, to Mr. A. A. Grubb for his aid in the experimental work and to Dr. M. E. Nordberg for constructing the quartz cells.Files
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- 2559
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- CaltechAUTHORS:JOHpr30
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